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Pension and Retirement Plans - Amounts recognized in the consolidated balance sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | $ (4,405) | $ (6,792)
Deferred tax | 95 | 24
Accumulated other comprehensive income | 4,218 | 6,120
Net amount recognized | (92) | (648)
Accumulated benefit obligation | (16,326) | (16,532)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,735) | (5,089)
Deferred tax | 17 | 14
Accumulated other comprehensive income | 4,161 | 5,960
Net amount recognized | 1,443 | 885
Accumulated benefit obligation | (14,656) | (14,829)
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,670) | (1,703)
Deferred tax | 78 | 10
Accumulated other comprehensive income | 57 | 160
Net amount recognized | (1,535) | (1,533)
Accumulated benefit obligation | (1,670) | (1,703)
International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,396) | (4,663)
Accumulated other comprehensive income | 4,140 | 5,934
Net amount recognized | 1,744 | 1,271
Accumulated benefit obligation | (14,317) | (14,403)
International | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,396) | (4,663)
Accumulated other comprehensive income | 4,140 | 5,934
Net amount recognized | 1,744 | 1,271
Accumulated benefit obligation | (14,317) | (14,403)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (2,009) | (2,129)
Deferred tax | 95 | 24
Accumulated other comprehensive income | 78 | 186
Net amount recognized | (1,836) | (1,919)
Accumulated benefit obligation | (2,009) | (2,129)
U.S. | Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (339) | (426)
Deferred tax | 17 | 14
Accumulated other comprehensive income | 21 | 26
Net amount recognized | (301) | (386)
Accumulated benefit obligation | (339) | (426)
U.S. | Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued benefit liability | (1,670) | (1,703)
Deferred tax | 78 | 10
Accumulated other comprehensive income | 57 | 160
Net amount recognized | (1,535) | (1,533)
Accumulated benefit obligation | $ (1,670) | $ (1,703)

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